Mohr 66 Reference Position Error

Hi
We have Mohr 66 recently installed less than 1 year back. We are getting this error " Reference Position Error" Acknolwedge (656). Please help how to resolve.

 

Error No.: 656
Error Text: REFERENCE POSITION ERROR
State: ERROR
Cause: The actual position loaded into the control counter when the reference position is
passed does not coincide with the reference position stored. The allowance
adjusted is also exceeded in this case (default = 0.008 cm).
This is caused by the loss of counting pulses during the backgauge run, or if the
mechanical reference switch detects "multiple" positions, or positions beyond the
range determined during the reference run.
On 78 ES, this error may be caused when the computer voltage is dropping
too fast.
Remedy: - Make a reference run and move the backgauge along the entire width of the table,
if the position of the mechanical reference point switch has been modified
- Use service menu "machine data" for troubleshooting
- Check / replace pulse transducer
- Check cable routes / connection.
- Check / replace board SAP
- Check / replace board CPxx
- Check mechanical reference switch (flush version, id. no. 228472 on POLAR 66)
and switching flag.
- Check power supply units G1 / G2 and replace, if necessary.